Arch-protector for furnace-doors.



No. 804,801. PATENTED NOV. 14, 1905. G. A. FISHER. ARCH PROTECTOR FOR FURNACE DOORS.

APPLICATION FILED Mum, 1905.

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UNITED STATES PATENT OFFICE.

GEORGE FISHER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE- THIRD TO PAUL SHOCKER, OF PROVIDENCE, RHODE ISLAND.

ARCH-PROTECTOR FOR FURNACE-DOORS.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed March 1,1905. semi No. 247,930.

To all whmn it may concern:

Be it known that I, GEORGE A. FISHER, a citizen of the United States, residing at Provideuce, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Arch-Protectors for Furnace-Doors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in arch-protectors for furnace-doors, and is especially designed for use in connection with the doors of steam-boiler furnaces.

The main and primary object of the present invention is the provision of a device of the character mentioned for the protection of the fronts of boilers from the intense heat incident to the fires of" the furnaces and which will also serve as a supporting-arch upon which the masonry may be built and sustained. A further object of the present invention is to provide a protector of the class mentioned the construction of which is such as to enable water taken from the boiler or feedwater to freely circulate through the protector, whereby a more even temperature may be given to the boiler-fronts and excessive expansion and contraction of the latter incident to the intense heat greatly diminished. When feed-water is circulated through the protector, amuch higher temperature is given to such water by reason of the exposed areas than when the same has passed through a feed-water heater.

With these general objects in view and others, which will appear as the nature of the improvements is better understood, the invention consists, substantially, in the novel construction, combination, and arrangement of parts, as will be hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the appended claims.

WVhile the form of the. invention herein shown and described is what is believed to be a preferable embodiment thereof, it is obvious that the same is susceptible of various changes in the form, proportion, and minor details of construction, and the right is therefore accordingly reserved to modify or vary the invention as falls within the spirit and scope thereof.

In the drawings, Figure 1 is a perspective view of an arch-protector constructed in accordance with the present invention, the dotted outline indicating the usual masonry boiler-setting and the protector being illustrated in duplex form. Fig. 2 is a longitudinal sectional view thereof. Fig. 3 is asectional plan view, the position of the transfer pipes being indicated by dotted lines.

Referring in detail to the drawings, the numeral 1 designates a series of headers arranged in substantially parallel relation,which headers may be either cast steel or iron, preferably the former, and each of which is hollow. The purpose of the latter is to permit water freely entering and circulating in the headers; but in order to impart to the water in its circulation a definite path, so that it may take up a maximum amount of the heat to which the headers are exposed, each of the headers is provided at a point approximately one-third of its length with a dividing-wall or partition 2, which extends transversely of the interior of the header. Thus the interior of each header has two separate non-communicating compartments of different sizes. It will also be noted that the headers are arranged in pairs, determined by the number of doors to the furnace, and that the headers of each pair are reversely arranged relatively to each other, whereby the compartments of one header are arranged diagonally opposite with respect to the corresponding compartments of the other header of the particular pair. This is to enable the free transfer of the water between the headers of the respective pairs and insures perfect circulation through the protector. To the accomplishment of this end each of the headers is provided in its top with a plurality of alined openings 3, and connected to these openings is a series of inverted-U-shaped transfer-pipes 4, forming the arch proper, through which pipes the water passes alternately from one header to the other.

When the protector is to be used in connection with furnaces having two doors, the duplex arrangement illustrated in the drawings is employed, and by referring to Fig. 3 it will be seen that the innermost of the headers are so positioned that the compartments of one are directly opposite the corresponding compartments of the other. This arrangement places the small compartments at the front, while the large ones are at the rear.

charge-pipe 7 is suitably connected to the.

other, the pipe 6 when not leading from a feed-water supply being connected to take the water from the boiler at a point near the bottom of the latter, and the pipe 7 returning the water to the boiler at a point just below the water-line.

Each of the headers is also provided at one end with a blow-off 8 and at the other end with a clean-out plug 9, so that any sediment which may accumulate therein may be easily blown or cleaned out at intervals.

In the use of the invention the water introduced through pipe I 6 enters the small compartment of the first header and meeting the dividing-wall 2 is compelled to flow upwardly through the transfer-pipe 3, connected with said compartment, through which pipe the water is delivered to the large compartment of the second header. Thence it flows back again to the large compartment of the first header, from which it is delivered to the small compartment of the second head er, from which it flows to:v the boiler if there is only one door to the furnace, being delivered by the pipe 5. If, however, the duplex form illustrated in the drawings is employed, as 'when the furnace has two doors, the water passes through pipe 5 to the small compartment of the third header, whence a course similar to that above described is taken by the water until it reaches the discharge-pipe 7, which delivers it to the boiler. The water in passing through the respective headers and transfer-pipes comes in contact with surfaces directly exposed to the heat of the fire, and hence absorbs the heat of such surfaces. Consequently the heat is not transmitted to the boiler-front, which therefore becomes free from the excessive expansion and contraction usually present and protecting the boiler-front to this extent. When feed-water is delivered to the protector, the same becomes heated to a high degree, and the use of a separate feedwater heater may be dispensed with. The water, as is readily apparent, traverses the protector three separate times when there is one door to the furnace, while in the case of two doors the water passes six times before the fire, thereby highly heating the same.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is

1. A device of the class described, compris ing a pair of headers each of which has at its interior a dividing-wall or partition extending transversely thereof and forming therein a pair of non-communicating compartments of different sizes, said headers being reversely arranged relatively to each other, whereby the compartments of one header are diagonally opposite the corresponding compartments of the other header, one of said headers having an inlet, and the other having a discharge, and

.a series of pipes connected to said headers but independent of each other for transferring the water from one header to the other.

2. A device of the class described, comprising a pair of headers each of which has at its interior a dividing-wall or partition extending transversely thereof and forming therein a pair of non-communicating compartments of different sizes, said'headers being reversely arranged relatively to each other, whereby the compartments of one header are diagonally opposite the corresponding compartments of the other header, one of said headers having an inlet, and the other having a discharge, and a series of inverted-U-shaped pipes connected to said headers but independent of each other for transferring the water from oneheader to the other.

3. A device of the class described, comprising a pair of headers each of which has at its interior a dividing-wall or partition extending transversely thereof and forming therein a pair of non-communicating compartments of different sizes, said headers beingreversely arranged relatively to each other, whereby the compartments of one header are diagonally opposite the corresponding compartments of the other header, one of. said headers having an inlet, and the other having a discharge, and a series of pipes connected to said headers but independent of each other for transferring the water from one header to the other, each of said headers being also provided with means for efilectingxcleansing of the same.

4. A device of' the class described, comp-rising a series of headers arranged in pairs, each of said headers having at its interior a dividing-wall or partition extending transversely thereof and forming therein a pair of noncommunicating compartments of different sizes, the headers constituting each pair being reversely arranged relatively to each other, whereby their corresponding compartments are diagonally opposite, a pipe for connecting the contiguous headersof the pairs, the outermost headers of the connected pairs having an inlet and a discharge, and a series of pipes connected to the headers of each pair butindependent of each other for transferring the water from one header to the other of the respective pairs.

In testimony whereof I afiix'my signature in the presence of two witnesses.

GEORGE A. FISHER.

Witnesses:

ABEL T. ATHERTON, ALEX. B. FISHER. 

